Facilitate mas running on macOS 10.15 & 11

[ed9w2in6]

I saw that the version 2.0 release message says mas now requires macOS 10.15 (Catalina) or newer.

However running the pre-built binaries will complain @rpath/libswift_Concurrency.dylib could not be loaded, this is due to @rpath/libswift_Concurrency.dylib seems to only available natively from macOS version >= 12. Referencing other swift projects:

• Reason: image not found majd/ipatool#50
• libswift_Concurrency.dylib not found on macOS 10.15 & macOS 11 realm/SwiftLint#4131

So I believe the documentations such as README should be updated to reflect this.

edit:
It can be solved by manually installing latest swift dylib / runtime.

[ed9w2in6]

BTW, the pre-built binaries at release for 1.8.7 are built for arm only, which the others are all universal binaries.

[rgoldberg]

@ed9w2in6 The 1.8.7 release had issues. Since 1.8.8 fixed those issues, and since 1.8.8 should run on all macOS versions that 1.8.7 does, the package installer wasn't rebuilt for 1.8.7.

[rgoldberg]

@ed9w2in6 Thanks for this report.

Requiring macOS 12+ to run mas was not intended.

Through the current mas version (2.1.0), macOS 12+ should be required to build mas (after, but not including, 2.1.0, in main, macOS 13+ is now required to build mas).

Through mas 1.9.0, mas should be able to run on macOS 10.13+.

For mas 2.x, mas should be able to run on macOS 10.15+, but obviously something went wrong.

The Apple docs lead me to believe that using Swift Concurrency would only require macOS 10.15. Unless Apple is completely wrong about their own products, it should be possible to build current mas to run on macOS 10.15+. I assume that there is some setting for the build process that must be set.

I will investigate this. If I find a solution, I'll release 2.2.0 with it ASAP.

Sorry for any inconvenience. I don't have any way to test running mas on macOS 11 or older, so as unaware that Apple led me astray.

[rgoldberg]

@ed9w2in6 On what version(s) of macOS are you experiencing this problem?

Please provide the output of each of the following command lines:

sw_vers -productVersion

sw_vers -buildVersion

sysctl -n machdep.cpu.brand_string

[rgoldberg]

@ed9w2in6 I think I found a solution, but I cannot test it myself:

You need to install a Swift runtime on your Mac. The runtime can be provided by Xcode or by a standalone runtime.

Current Swift docs offer multiple ways of installing a Swift runtime.

I don't know if Swiftly can run on macOS 10.15 or 11, but I'd try that first, then try to install the newest runtime that it thinks will work, follow its instructions, and open a new shell. If that doesn't work, try the other listed options.

If none of those work, I found elsewhere that the Swift 5.5.3 runtime should be able to be installed on 10.15 or 11 via:

curl -O https://download.swift.org/swift-5.5.3-release/xcode/swift-5.5.3-RELEASE/swift-5.5.3-RELEASE-osx.pkg
sudo installer -pkg swift-5.5.3-RELEASE-osx.pkg -target
echo 'export DYLD_LIBRARY_PATH=/Library/Developer/Toolchains/swift-5.5.3-RELEASE.xctoolchain/usr/lib/swift/macosx' >> .zshrc

Then exit your shell & start a new shell.

But I don't know if macOS 10.15 or 11 support any newer Swift runtimes.

Please let me know the results of the above options. Thanks for any help.

[ed9w2in6]

@rgoldberg Actually I am rewriting the built script for nix at nixpkgs to built from source.

I have not tried your solution exactly but when using install_name_tool to change the dylib to point to some newer version that has @rpath/libswift_Concurrency.dylib it seems to run as expected.

At some point Apple decided to only provide xcode cli tools only via softwareupdate, which means for macOS versions that Apple drop supports will not be provided with updated dylibs.

In my case my swift stucked at:

Apple Swift version 5.4 (swiftlang-1205.0.26.9 clang-1205.0.19.55)
Target: x86_64-apple-darwin20.6.0

But by obtaining the dylib from other sources, it works as expected.

Here is the output of mas config:

❯ mas config
mas ▁▁▁▁ 2.1.0
arch ▁▁▁ x86_64
from ▁▁▁ nix/nixpkgs/mas
origin ▁ https://github.com/mas-cli/mas.git
rev ▁▁▁▁ v2.1.0
driver ▁ 
swift ▁▁ Swift version 5.8 (swift-5.8-RELEASE)
region ▁ US
macos ▁▁ 11.5.1 (20G80)
mac ▁▁▁▁ MacBookPro13,3
cpu ▁▁▁▁ Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz

[rgoldberg]

@ed9w2in6 Thanks for the info.

I don't know what install_name_tool is.

How did you obtain the newer version of the library to point to?

I think that using one of the methods from the Swift page to which I linked would be best, falling back on using the Swift 5.5.3 runtime installation commands I provided, assuming that any of them work.

More info about how you got the runtime installed would be helpful for documenting the process for other 10.15 or 11 users

Thanks for any info you can provide.

You don't need anything more from me, right? If there's more that you need, please let me know.

[ed9w2in6]

@rgoldberg

I don't know what install_name_tool is.

CLI tool provided by Apple that can be used to tweak dylib install name.
Use otool -L to see linked dylib, then use install_name_tool -change ... to change dylib (e.g. libswiftCore.dylib) should be the same as your suggested method of setting DYLD_LIBRARY_PATH.

How did you obtain the newer version of the library to point to?

Compiled from Apple's source on github, done via nixpkg (ref).

More info....

Sure, I have created a nice nix build script that can build to any commit, with or without latest swift. There are still some issue but I will upsteam to nixpkgs later on.

You don't need anything more from me, right? If there's more that you need, please let me know.

I struggle to get mas account work, which I have bisected the source. It seems that commit b417ea0, details at #417.

Since that commit is before v2.0.0 we should probably update the documentation about this.